Electric signaling system and selective mechanism therefor.



No. a59,4'73.

PATENTED JULY 9, 1907. J. F. WEBB, Jn.

ELEGTRIG SIGNALING SYSTEM AND SELECTIVE MEGHANISM THEREFOR.

APPLIOATION FILED AUG- 26, 1906- 6 BHEETB-SHE Jc'uz 767/852 Jr.

Ill/VENTOR W/MESSES:

ATTORNEYS- THE "cums PETERS ca, wnsnmamu, 1:. c.

P ATBNTED JULY 9, 1907. J. P. WEBB, JR.

ELECTRIC SIGNALING SYSTE M AND SELECTIVE ME GHANISM THEREFOR.

APPLICATION PILED'AUG-26,1906- 6 SHEETS-SHEET 2.

INVENTOH JQQREJKEZZ Br N I 02w;

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PATENTED JULY 9, 1901. J. P. WEBB, JB.

HANISM THEREFOR.

ELECTRIC SIGNALING SYSTB M AND SELECTIVE MEG APPLIOATIOI FILED AUG. 35, 1906 8 SHEETS-SHEET 3,

. WITNESSES:

mg l t 1n: Ivomus PETERS ca, Insnlucrmv o c PATEN TED JULY 9 A J. P. WEBB, JR- ELECTRIC SIGNALING SYSTEM AND SE LEGTIVE MECHANISM THERE FOR.

APPLICATION FILED 116.26. 1906.

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Nor 859,473. PATENTEDJULY 9, 1907.

' J. F. WEBB, J11.

ELECTRIC SIGNALING SYSTEM AND SELECTIVE MECHANISM THEREFOR. I APPLICATION rum) we. 2a, 1906. y

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UNITED STATES PATENT OFFICE.

JEAN F, WEBB, J'R., OF CHICAGO, ILLINOIS, ASSIGNOR TO THE ELECTRIC SIGNAGRAPH AND SEMAPHORE 00., INCORPORATED.

ELECTRIC SIGNALING SYSTEM AND SELECTIVE MECHANISM THEREFOR.

Specification of Letters Patent.

Patented July 9, 1907.

Application filed August 25,1906- I Serial No. 332,017.

To all whom it may concern:

Be it known that I, JEAN F. WEBB, J r., residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in 5 Electric Signaling Systems and Selective Mechanism Thereior, of which the following is a specification.

My invention relates to certain new and useful improvements in electric signaling systems and selective and it particularly has for its mechanism therefor,

object to provide a system of the selective type in which the operative parts and circuits are so arranged and combined as to clearly, effectively and accurately serve their intended purposes, the arrangement of parts being such that any desired station of a number of stations may be selected from the home. or central station and signaling with said station be had.

In the practical application of my invention, the

same-may be adapted for use in connection with block signaling for railways, or it may be used in connection ,with other signaling systems, if desired.

In its generic nature, my invention comprises a plurality of step-by-step circuit controllers to bring any desired station in circuit with the home or central station.

Again, my invention comprises an improved. type of signaling circuit.

With other objects in view than have been heretofore specified, the invention also comprises certain novel construction, combination and arrangement of parts, all of which will be firstdescribed in detail, and then be specifically pointed out in the appended claims, reference being had to the accompanying drawings, in which Figure 1, is a diagrammatic view, illustrating the arrangement of parts, the home or central station and two substations being shown. Fig. 2, is a front elevation of the selective mechanism, the housing therefor being shown in section.

Fig. 3, is a side view of the parts shown in Fig.2. Fig. 4, is a cross section on the line 4-4 of Fig. 2. line 5-5 of Fig. 2.

Fig. 5, is a cross section on the Fig. 6, is a perspective view of the selective mechanism, the casing being removed. Fig. 7, is a detail vertical longitudinal sectionshowing-the selective parts without the escapement parts; Fig; 8, is a similar view showing the escapement parts;

is a top view showing the armature and-the ratchet wheel together with the escapement wheel and their axle, and the escapement verge with its axle.

is a diagrammatic view showing a modified Fig. 10, arrangement of my system. Fig. 11, is a detail view of the contact disk. Figs. 12 and 13 are detail views of a modification of my invention.

Referring now to the accompanying drawings in which like numerals and letters of reference indicate like parts in all of the figures, 1 denotes the line wire of the selecting circuit while the line wire of the signaling circuit is represented by the reference numeral 2 in the form of my invention shown diagrammatically in Fig. 1.

Each station (home, station A, station B) has its mechanism in electrical connection with the line wire 2 of the signaling circuit by branch wires 2, as shown, the respective electro operative parts of the mechanism of each station that are controlled by the Wires 2", being connected in parallel with one another.

The selecting mechanism of each station has its selecting magnet 17 connected in series with the line wire 1, thus connecting all selecting magnets 17 on the line in series with. the home station apparatus hereinafter referred to.

Since the operative mechanism at all sub-stations is the same, a detail description of one sub-station mechanism is thought will be sufiicient.

Each sub-station mechanism comprises a housing or casing 40, preferably hermetically sealed, in which a rectangular frame 13 is mounted by screws 44, the frame 13, in practice, being preferably in the nature of a brass casting and forms what I shall hereinafter term the magnet supporting frame. The electro magnets 17 have their cores 17 screwed to a cross bar 17" which is in turn adjustably fastened to the upper bar 13? of the frame 13 by a bolt 45 and nuts 45. Near the lower end, the frame 13 is provided with a pair of laterally projecting lugs 13"which receive the fulcrum screws 19, by means of which the armature 22 is pivoted in the frame 13.

The armature 22v is provided with bearing portions 22 and 22 to respectively receive the metallic pawl the check nuts 26 in the lower bar 13 of the frame 13.

The terminal wires of the magnet 17 connect with binding posts 5 and 6 on the outside of the housing 40 to which the line wire 1 is electrically connected by 1 leads P 1.

7 designates a binding post on the housing 40 which screws into the frame 13 and is connected to the wire 2 of the signaling circuit,

r 14 designates another supporting frame of similar pitman serving to insulate the as being of the ordinary type .wire 1, andfrom thence in a similar manner through all the stations on the'line and grounded from the line wire 1 at the final station.

When it is desired to operate a signal at any'particular station, the circuit just mentioned is closed and opened by the circuit closer 3 a sufficient number of times to bring the pawl 23 of the respective station desired in contact with 'the circuit closer 29 at that particular station. Each closing of the circuit by the circuit closer 3 sends electrical impulses over the line wire 1, which energizes the magnet 17' of all stations, thus attracting their armatures 22 upward; each raising of the armature 22 rotates the ratchet wheels 27, one cog, by reason of the engagement .of the pawls 23 in the teeth of the ratchet wheels 27, likewise oscillates the verges 32 of the escapement wheels 28 so that and the contact wheel 27 can turn only one cogat each raising of the armature. Each breaking of the circuit overthe line wire 1, by the circuit closer 3 demagnetizes theelectro magnet 17, thus permitting their armatures22 to dropbyv gravity into their normal positions, the pawls 23 engaging the succeeding lower cogs of the wheels 27 (the upper end of the pawls making a contact against the face of the cogs by reason of the gravity of the .heavier lower portion) and the verges 32 engaging the succeeding teeth of the wheels 28. When the wheels 27 have been rotated until the-circuit closer 29 of theldesired station is in contact with the pawl 23 at the particular-station where the signal is to be given ,(see station B, Fig. 1) the signal is operated by closing the circuit on theline wire 2 throughthe medium of the make. and break circuit closer 4. The signaling circuit includesa source of electrical energy 39*, grounded at one side at the home office, and when the circuit closer 4 of the signaling circuit is closed, thetcurre nt flowsirom the source of electrical energy 39 through the line-wire 2 andlead 2 of thedesired station into the supporting frame 130i such station and from thence across the armature 22 and pawl 23 to the contact 29 of the wheel 27 and from thence through axle 30 and frame 14 to binding post 8 and throughlead 38 to signal :37 and from signal 37 to ground lead 38, thus the actuating ofthe controlling mechanism or circuit closer 4 at the home ofiicewill actuatethebell or otherfsignal- ,ing device 37 at'the station desired. In place of the ground return, a metallic connection may be used, if .desired, as is'well known-in the art, and hence illustration thereof is thought to be unnecessary.

-When@the formof my system disclosed in Fig. 10 is .used, it will be seen that 1 merge the signal .wire 2 and the selecting line wire 1 into a single .wire 1 which connects with a circuit closer 3 having the contacts 3 and 3 of the same type as that showninFig. 1 .of the drawings. The, circuit controller 3 at the home station also connects with the fulcrum point 50 of a switch lever 49 that cooperateswith contacts 47 and 48, which connect respectively through wires 2 and 1 withsources of electrical energy 39 and 39*, which sources ofelectrical energy have their otherterminals grounded, as indicated. Ateach sub-station I provide relays 51 and 52 conform to the frame 13, which I shall hereinafter term the wheel supporting frame. The wheel supporting frame 14 has lateral lugs 14 to receive pivot screws 20, which pivotally' support the axle30 that carries the contact wheel 27 and the escapement wheel 28, the axle 30 having an enlargement 31 to enable the wheels 27 and 28 to be readily secured thereto. The l'rame 14 is secured in the housing by screws 44.

The contact wheel 27 is constructed of fiber or other insulating material, in practice, and zlS. provided with a definite number of ratchet teeth 27 to cooperate with the pawl 23, which has a weighted :portion 23 so that it will alwaysbeheld in contactiwith the wheel 27. The wheel 27 is provided .with a suitablyarranged contact plate 29 termi nating in a metallic ,cog or tooth 29 (see Fig. .'11)-to act asa circuitcloser, it being understood that the cogs 29 on the wheels .27 of the different sub-station mechanisms are arranged to correspond to the number of substations-so that only one station will haveits cog 29 in contactwiththepawl I 23 at atime.

The escapement wheel 28 hasteeth 28 -to correspond in number with those onthe wheel,27 The verges 32 of theescapement wheels28 are mounted on a shaft 35 which is fulcrumed on set screws 21 that are held in lugs 14" laterally projecting from the=frame 14.

33 designates an actuating arm ,for the verges 32, which arm is lulcrumed at 34 to the pit-man 25, the armature 22 from the escapenient mechanism.

A set screw 8 on the casing 40 passes into the frame 14 and is electricallyconnected 'bya .wire,38 .withthe signal 37 which is in turn grounded through a -.wire 38, as indicated. The signal '37 may be any .desired electrically controlled or operative mechanism, but for convenience of illustration 1 haveshownsuch signal as being an ordinary electric bell, although I desire it understood that I do not lianitrnyself tosuch type of signal.

At the home station I provide a'normally open make and breakcircuitcloser 4'whose contacts 14 and 4 are respectivelylconnected to'the line-wire 2and a source of electrical energy 39, asdndicated. A second normally open make and break circuit closer 3 being provided which has oneof its'terminals 3 connected to line wire 1 andthe other terminal 3 connected to a source oi electrical energy 39, both sources of electrical energy 39 and 39.having,their other terminals grounded, asindicated.

The .circuit closers 3and 4gmay be otanyoapproved type and either automatic in'their, operation or otherwise, as the specificconstruction otsuch'circuit closers form 1 no part of my present invention, -but for convenience of illustration I have shown such circuit closers of push button.

Operation. So far as described, the manner, in which my invention operates, will be bestexplai'ned as'follows:-The operator desiring to calla particular station irom the home office Workszthe circuit .closer 3'to1 close the circuit a definite number of times, depending upon thetstation to be called. When thecircuit is: closed by the circuit closer 3, the electricaljcircuit is made from ground through battery 39,, make. and'break circuit closer 3, line wirel, binding post 5, electromagnet 17, of station A, binding post 6 of station A, line .of the final station isgrounded asbefore.

v The object of themethod of wiring disclosedin Fig. I 10 is to eliminate the use of one wire and handle the the escapement wheels I 'nectedin-series with the line .wire 1*, the line wire 1 whole system on a single line, which is probably the way it would be done commercially. I

There are two ways in which the method of wiring disclosed in Fig. 10 may be used, first, by changing the direction of the current flowing over the line wire 1*, so that when source of electrical. energy 39 is used, the relays are polarized with say, a positive pole toward the armatures, and when source of electrical energy 39 is used the relays are polarized with say, negative pole toward the armatures. In this case, the armatures 55 of the relays 51 must'bepermanently polarized so that they are attracted when source 39 is,

used, but repelled when source 39 is used,while the armatures 56 of the relays 52 must be permanently polarized so that they are attracted when source 39- is used but repelled when source 39 is used, it being understood that the sources of electrical energy 39 39 are arranged to send a current impulse over the line wire 1* in opposite directions. The second way in which the method of wiring shown in Fig. 10 may be used, is as follows :By sending out a weak current from source of electrical energy 39 and a strong current from source 39 and in this case the magnets of the relays 51 must be wound so that they will act with a weak current while the magnets of the relays 52 must be Wound so that they will act only with a strong current.

In Fig. 10 the reference numeral 39 designates a source of negative electrical energy (or strong electrical energy as the case may be) while 39 indicates a source of positive electricalenergy or weak electrical energy,

as the case may be.

51 designates a polarized relay'operable only with I positive current (or with weak current, as'the case may be) while the relay 52 operates with a negative current (or with'a strong current, as the case maybe).

53 designates a source of'local electrical energy controlled by the relay 51 and 54 designates asimilar source of electrical energy controlled by the relay 52.

The polarized armatures 55 of the relay51 are connected through leads 59' with the source of electrical energy 53, which isin turn connected through a lead 59 with the magnet 17 of'the selecting and signaling controlling mechanism of the respective stations. The

other terminal of the magnet 17xconnects through a lead 59 with'the contact point 57 that coijperates with the armatures 55 to close the local 51 is operated.- M 1 g p The source of electrical energy 54 connects through circuit when the relay leadfil with the armature 56 of the relay 52, which cooperates withafixed, contact point 58 that connects through a lead .60 with the binding post 7 of the select-' ive mechanism. The'bin ding post Set the selective mechanism asbefore, connects through a lead 61? with the signal 37, which in turn connects through a lead 61", with the'battery or local source of'electrical energy I 54, thus completing the local signaling circuit. i

In the form of my invention shown in Fig-"10,the operation is as follows: The switch 49 is movedto con nect contact points 48 and 50. The make and break circuit closer 3 is operated tosend a sufficient number i I of impulses over linewire 1? to bring pawls 23 in contact with circuit closer 29v of the desired station (station B). With each closing of'the circuit at closer 3, i

a claims.

29 at' the station where the signal is to be given, the

switch 49 is moved to connect contact points 47 and 50 and the closing of the circuit by the circuit closer 3 sends an impulse over line wire 1 which affects the armatures of the relays 52 only. The attraction ofthe armatures 56 causes them to touch contact points 58, and thus close thelocal signaling circuit, which operates the signaling devices 37 at that station where the pawl 23 is in contact with the circuit closer 29, since the local signaling circuit is open at the other stations,

by reason of the pawls 23 and the contact 29 thereof being out of contact with one another.

' In Figs. 12 and 13 I have shown a modified form of my invention in which the frames 13 and 14 are dispensed with and the housing is made to serve the sup porting function of such frames. In this case the housing 40 may be made oi fiber, rubber or wood, and

spacing rods may be provided between the side walls of the housing wherever desirable. In these fig ures I have shown only the most essential parts of my apparatus.

In the practical application of my invention I propose to have an indicating mechanism at the home ofiice, of any suitable type to indicate which station is in connection with the home office at any time, but since this mechanism forms no part of my present invention, but will form the subject matter of a later application, I do not deem it necessary to illustrate or describe the same at this time,'since the system is periectly operable by the mechanism shown and described l herein, as being present in the fhome office.

The essential features of my selective mechanism, I

' desire it understood, reside in the provision of the uni-Y directionally rotatable circuit closing disk 27 operable directly by the armatureof the electro magnet 17, to-

When the pawl 23 is in contact with the circuit closer gether-with the escapement wheel and verge directly 5 controlled by the armature of the electro magnet 17.

I "From the foregoing description taken inlconnection with the accompanying drawings, it is thought the complete construction, operation and numerous advantages of my present invention will be readily un- What I claim is'f. 1. A selective signaling-system, comprising in combina:

-tion a mainstation and a plurality of substations, a selectingcircuit and a signaling circuit common to all of said stations, means atthe main station in each of said circuits for sending electrical impulses through the respective circuits at times, selecting mechanism and signal mechanism at the substations, each of said selective mechanism comprising a rotatable shaft, a'contactrdisk carried thereby,

operating magnets electrically connected in the selecting circuit, and armature for said magnets, means for imparting step -by -step movement tosaid contact disk, and an esderstood by those skilled in the art-to which it apper ,rent from the respective sources of electrical energy .ed in both of said circuits and comprising in combination for engaging said contact carrying disk,

said frames in said housing, substantially as shown and described.

7. The combination with a housing, a magnet carrying frame rigidly held therein, and a wheel carrying frame rigidly held therein, operating magnets adjustably suspended in said magnet carrying frame, said magnet carrying frame having bracket portions, an armature fulcrum in said frame between said bracket portions, means beneath said armature for limiting the movement thereof and adjusting the same, said armature having a pair of bearings, a pawl pivotally mounted in one of said bearings, an insulating member pivotally mounted in the other bearing, said wheel carrying frame having lugs, a wheel shaft fulcrumed between said lugs, an insulating contact carrying ratchet disk on said last named shaft, an escapement wheel likewise mounted on said last named shaft, said armature pawl adapted to engage with said insulating shaft carrying disk, said wheel carrying frame having supplemental lugs, a supplemental shaft mounted between said lugs, an escapement verge carried by said supplemental shaft and cooperating with the escapement wheel, and pivotal connections between said insulating armature member and said verge, substantially as shown and described.

8. The combination with a housing, a magnet carrying frame rigidly held therein, and a wheel carrying frame rigidly held therein, operating magnets adjustably suspended in said magnet carrying frame, said magnet carrying frame having bracket portions, anarmature fulcrumed in said frame between said bracket portions, means beneath said armature for limiting the movement thereof, and adjusting the same, said armature having apair of bearings, a pawl pivotally mounted in one of saidbearings, an insulating member pivotally mounted in the other bearing, said wheel carrying frame having lugs, a wheel shaft fulcrumed between said lugs, an insulating contact carrying ratchet disk on said last named shaft, an escapement wheel likewise on said lastnamed shaft, said armature pawl adapted to engage with said insulating shaft carrying disk, said wheel carrying frame having supplemental lugs, a supplemental shaft mounted between said lugs, an escapement verge carried by said suplemental shaft to coiiperatewiththe escapement wheel, pivotal connections between said insulating armature member and said verge and means for energizing said magnets intermittently to move said contact carrying disk in one direction, substantially as shown and described.

9. The combination with a housing, a magnet carrying frame rigidly held therein, and a wheel carrying frame rigidly held therein, operating magnets adjustably suspended in said magnet carrying frame, said magnet car rying frame having bracket portions, an armature ful crumed in said frame between said bracket portions, means beneath said armature for limiting the ,movement thereof, and adjusting the-same, said armature having a pair of bearings, a pa'wl pivotally mounted in one of said bearings, an insulating member pivotally mounted in the other bearing; said wheel carrying frame having lugs, a wheel shaft fulcrumed bet-ween said lugs, an insulating contact carrying ratchet disk on said last named'shaft, an escape1nent,wheel likewise on said last named shaft, said armature pawl adapted to engage with said insulating shaft carrying disk, said wheel carrying frame having supplemental lugs, a supplemental shaft mounted between said lugs, an escapement verge carried by said supplecapement device comprising an escapement wheel carried by said rotatable shaft, an escapement ,verge pivotally mounted for cooperation with said escapement wheel and cooperatively connected with said armature, said armature and said disk contact and said signal being in the signaling circuit,

2. In a selective signaling system, a main station and a plurality of substations, an electric circuit common to all of said stations, a stepby-step indicator mechanism for each of said substations, said indicator mechanism comprising operating magnets in electrical connection with the common circuit, armatures for said magnets, a rotatable contact carrying ratchet disk, a'pawl carried by said armature for engaging said disk, escapement means connecting the armature with the ratchet disk, means for insulating the connection between the armature and the escapement devices, a signal in circuit with the.disk contact, and means at the main station for sending impulses through the common circuit to operate the operating magnets and the signal, substantially as shown and described.

3. In a selective signaling system, a main station and substations, a main line wire common to all of said sta tions, a make and break circuit-controlling device in the home station connected with the line wire, a switch connected with said make and break circuit controlling device, a pair of independent sources of electrical energy connected with said switch, a pair of relays for each station in cir' cuit with the line wire and operable respectively by curat the home station, a-step-by-step selective mechanism including operating magnets in circuit with one of said relays, and including step-by-step contact devices in circuit with the other relay, and an electric signal in circuit with said other relay, substantially as shown and described.

4. A step-by-step circuit controlling mechanism, comprising in combination a magnet supporting frame, operating magnets adjustable in said frame, an armature pivotally mounted in said frame, means for adjusting and limiting the movement of said armature, a wheel carrying frame, a shaft rotatably mounted in said'wheel carrying frame, a contact carrying-disk having ratchet teeth mounted on said shaft, an escapement wheel also mounted on said shaft, a pawl carried by said armature for engaging said contact carrying disk, an escapement verge pivotally supported on said wheel carrying frame, and insulating connections between said armature and said verge, substantially as shown and described.

5. In a selective signaling system, an operating circuit and a signaling circuit, sources of electrical energy forsaid circuits, make and break circuit closers, and a stepby-step circuit controlling mechanism electrically connecta magnet supporting frame, operating magnets adjustably held in said frame, an armature pivotally mounted in said frame, means for adjusting and limiting the movement of said armature, a wheel carrying frame, a shaft rotatably mounted, in said wheel carrying frame, a contact carrying disk having ratchet teeth mounted on said shaft, an escapement wheel mounted on said shaft, a pawl carried by said armature for engagingsaid contact carrying disk, an escapement verge pivo tally supported on said wheel carrying frame, insulating connectionsbetween said armature and said verge, said operating magnets electrically connccted in the operating circuit, and said magnets carrying frame and said wheel carryingframe electrically connectedin the signaling circuit, substantially as shown and described.

(i. A step-by-step circuit controlling mechanism, comprising in combination a magnet supporting frame, operating magnets adjustably supported in said frame, an armature pivotally mounted in said frame,'meansfor adjusting and limiting the movement of said armature, a wheel car- .rying frame, a shaft rotatably mounted in said wheel carrying frame, a contact carrying disk having ratchet teeth mounted on said shaft, an escapement wheel also mounted onsaid shaft, a pawl carried by said armature, an escapement verge pivotally supported on said wheel carrying frame, insulating connections between said armature and said verge,-and a housing for the whole, means for supporting pivotal connections between said insulating armature member and said verge, means for energizingsaid magnets intermittently to move said contact carrying disk in.one direction, and asignalingcircuit including said frame, clesable bythe armaturetpawl and the disk carrying member, substantially as shown and described.

prising in. combination, a suitable'supporting frame, an electro-magnet, an oscillating armature, a'uni-directionally rotatable 'circuit closer carrier, a pawl pivotally .mounted on said armatureand intermittently engaging with said carrier, and an escapement wheel rotating synchronously with said carrier, and an escapement verge cooperating therewith and means cooperatively connecting mental shaft and cooperatingwith the escapement wheel,

10. A step by step circuit, controlling mechanism, com-.

the escapement verge with the armature to be operated thereby at each impulse thereof.

11. A step by step circuit controlling mechanism, comprising in combination, a suitable supporting frame, an electro magnet, an oscillating armature, a uni-directionally rotatable circuit closer carrier, a pawl pivotally mounted on said armature and intermittently engaging with said carrier, an escapement Wheel rotating synchronously with said carrier, an escapement verge cooperating therewith, and means for intermittently oscillating the said verge by the movement of said armature.

12. A step by step circuit controlling device comprising in combination with a suitable supporting frame, an electro magnet, an oscillating armature therefor, a uni-directionally rotatable circuit closer having a contact portion, a pawl pivotally mounted on said armature and engaging said circuit closer and arranged to engage the contact thereof, once in each revolution of the rotatable circuit closer, an escapement wheel rotating synchronously with said rotatable circuit closer, and an escapement verge co operating with said escapement wheel, an insulating connection between the escapenient verge and the armature for imparting the armature motion to the escapement verge to oscillate the same, substantially as shown and described.

13. The combination with an intermittently energized electro magnet, and an armature therefor, of a rotatable shaft, :1 contact carrying disk mounted on said shaft, a contact pawl carried by the armature for engaging said contact carrying disk, an escapement Wheel mounted on said rotatable shaft to turn with the contact carrier, an escapcmentverge cooperating with said escapement wheel, an insulating member pivotally connecting the escapement verge with the armature, and said armature carried pawl being electrically connected, said rotatable shaft and the contact of the contact carrier being electrically connected, and means for electrically connecting the terminals of an electric circuit to the armature and the rotatable shaft respectively, substantially as shown and described.

JEAN l WEBB, JR. 

